JP2004076275A - Guard fence - Google Patents

Guard fence Download PDF

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JP2004076275A
JP2004076275A JP2002234098A JP2002234098A JP2004076275A JP 2004076275 A JP2004076275 A JP 2004076275A JP 2002234098 A JP2002234098 A JP 2002234098A JP 2002234098 A JP2002234098 A JP 2002234098A JP 2004076275 A JP2004076275 A JP 2004076275A
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Japan
Prior art keywords
net
rope
columns
protective fence
synthetic resin
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JP2002234098A
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JP3944550B2 (en
Inventor
Yutaka Hosokawa
細川 豊
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SANWA SEKKEI KK
Raiteku KK
Kaihatsu Concrete KK
Wakow Bussan Co Ltd
Original Assignee
SANWA SEKKEI KK
Raiteku KK
Kaihatsu Concrete KK
Wakow Bussan Co Ltd
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Priority to JP2002234098A priority Critical patent/JP3944550B2/en
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Abstract

<P>PROBLEM TO BE SOLVED: To provide a guard fence excellent in workability, simple in construction, executable in low costs, and further excellent in absorption of energy of falling rock. <P>SOLUTION: A net 11 made of a synthetic resin is spread between posts 2L , and the posts 2L are tiltably erected. A counterfort rope device 61 is settled between the upper part of the post 2L and a slope face 101 of a mountain side Y. The superfluous part is set in the rope 62 of the rope device 61 and a buffer member 63 slidably holding the superfluous part is also set. Since the synthetic resin net 11 has a large elongation until the breakage, as compared with a steel net, when catching a falling stone, the net 11 extends to the other side and absorbs a shock. When a specified or larger force acts on the post 2L from the net 11 hit by a falling stone, the superfluous part slides against the buffer member 63 and the post 2L is tilted to the other side to absorb the energy of the falling stone. <P>COPYRIGHT: (C)2004,JPO

Description

【0001】
【発明の属する技術分野】
本発明は、山腹の傾斜面部等に構築し、積雪や落石等を受け止めて道路等への落下、流入することを防止する防護柵に関する。
【0002】
【従来の技術】
従来から山腹の斜面部等に構築して落石や積雪等を受け止めて道路等への落下、流入を防止する防護柵が知られており、例えば、特開平7−197423号公報には、山腹の斜面部に間隔を置いて縦孔を穿孔し、この縦孔に建て込んだパイプ支柱を並設すると共に、これら各パイプ支柱に複数段のケーブルとともに金網を張設した落石等の防護柵が提案され、防護面には金網が用いられている。
【0003】
また、防護面に用いる網に係り、特開2000−273827号公報には、防護ネットは鋼製又はワイヤー等の剛性線材を並行に取り付けたものや、剛性線材でネット上に編成したもの、複数の水平ロープ材と金網を組み合わせたもの等、公知の各種ネットを含むものである(公報第0011段)と記載されている。
【0004】
上記従来技術のように、この種の網を用いる防護体では、ワイヤーロープや鋼製の網を組み合わせることにより、落石等から道路などを防護するようにしている。
【0005】
しかし、鋼製のワイヤーロープや網を用いるものでは、部材自身が重量物となるため、据付用の重機が必要となり、施工範囲に制約を受け、工期の長期化し、工費が嵩む問題がある。そして、落石防護のために設けられる防護体は重機の使用に不向きな山の斜面などに設けられることが多いため、このような山の斜面に防護体を設ける施工では、部材が重量物であると、その搬入作業も煩雑となり、施工性に劣る問題がある。
【0006】
また、従来の防護柵では、網に落石を受けると、該網が変形して落石のエネルギーを吸収し、同時に網から支柱に落石のエネルギーが加わり、最終的に曲げモーメントを受けた支柱が変形してエネルギーを吸収する。そして、従来の鋼製の網を用いる防護柵では、網を構成する線材は引張強度に優れるから、落石エネルギーの大きな場合に有効である。しかし、このように大きな落石エネルギーを受ける防護柵では、支柱及びこれを立設する基礎も大型なものが必要となる。
【0007】
そして、防護柵が落石を受けてから該落石が停止するまでの衝撃吸収時間を長くできれば、落石エネルギーの吸収効果を高めることができる。そこで、防護柵の分野とは異なるが、実開平2−37920号公報の屈倒式仕切用ポールには、ばね材などの屈曲体をポールの下部に設け、ポールを屈倒可能としたものであり、防護柵の支柱を前記ポールのように屈倒可能とすれば、落石を受けてから支柱が倒れる時間だけ、前記衝撃吸収時間を長くすることができ、落石エネルギー吸収効果が向上する。
【0008】
しかし、従来の防護柵において、支柱を屈倒可能にすると、斜面などに支柱を斜めに設置する場合、自重で支柱が谷側に傾いたり、谷からの風を受けると山側に揺動したりする不具合が予想され、また、単に支柱を傾動可能にしても、未だ十分な吸収効果を得ることができない。
【0009】
本発明は、施工性に優れ、工法簡易にして低価格での施工を可能とし、落石等のエネルギー吸収効果に優れた防護柵を提供することを目的とする。
【0010】
【課題を解決するための手段】
請求項1の発明は、支柱間に合成樹脂からなる網を張設した防護柵であって、前記支柱を傾動可能に立設し、前記支柱の上部と該支柱一側の地山との間に控えロープ装置を設け、この控えロープ装置のロープ材に余長部を設けると共に、この余長部を摺動可能に把持する緩衝具を設けたものである。
【0011】
この請求項1の構成によれば、合成樹脂からなる網は鋼製などの網に比べ、変形し易く、切断までの伸び率が大きいから、落石を受けると、網が他側に伸びて衝撃を吸収し、落石を受けた網から支柱に所定以上の力が加わると、緩衝具に対して余長部が摺動して支柱が他側に傾動する。このように落石を受けると、網が他側に変形すると共に伸び、さらに、支柱が他側に傾動することにより、落石を受けてから網が変形移動する量及び時間が大となり、衝撃吸収能力が効果的に向上する。
【0012】
また、支柱が他側に傾動する際、緩衝具に対して控えロープの余長部が摺動することにより、落石エネルギーの一部を吸収できる。
【0013】
そして、網を合成樹脂とすることにより軽量となり、施工運搬において、クレーンなどの大型重機が不要となり、地形的に施工に制約を受ける場所にも防護柵を設置することができる。また、合成樹脂製の網は柔軟性を有するから、搬入時にも巻く等することにより、コンパクトにでき、同時に現場での作業性も良好となる。
【0014】
また、請求項2の発明は、前記支柱の他側の傾動位置を位置決め決めする他側位置決め手段を備えるものである。
【0015】
この請求項2の構成によれば、落石を受けると、網が他側に伸びて衝撃を吸収し、落石を受けた網から支柱に所定以上の力が加わると、緩衝具に対して余長部が摺動して支柱が他側に傾動し、この他側の傾動は他側位置決め手段により位置決めされる位置まで行われた後、支柱が止まり、この後、静止した支柱の強度及び網が更に他側に伸び変形することより落石のエネルギーを効果的に吸収することができる。
【0016】
また、請求項3の発明は、前記他側位置決め手段は、前記地山に固定した支柱用取付部材と、前記支柱に設けられ前記取付部材に当接する当接部とを備えるものである。
【0017】
この請求項3の構成によれば、取付部材に支柱を取り付け、支柱が他側に所定量だけ傾動すると、当接部が取付部材に当接し、支柱の傾動が規制される。
【0018】
また、請求項4の発明は、前記緩衝具には、ロープ材を所定の摩擦力で把持する把持具を複数設けたものである。
【0019】
この請求項4の構成によれば、把持具を複数設けることにより、ロープ材の摩擦摺動による衝撃吸収効果を高めることができる。特に、共通の把持具を用意し、その数を調整することにより、所望の衝撃吸収効果が得られるから、把持具を汎用品として使用することができる。
【0020】
また、請求項5の発明は、前記網が無結節網である。
【0021】
この請求項5の構成によれば、網を構成する線材は、交差部において結ばれずに真っ直ぐに形成されているため、網に力が加わると、その力が網全体に分散するため、高い衝撃吸収機能が得られる。また、結節がないから、その分軽量となり、重ねたり、折ったり、巻いたりした際、コンパクトになる。
【0022】
そして、結節網では、線材を交差部で結ぶ際に交差部の線材に引張力が集中するからその部分が弱く成り易いが、無結節網ではこのような問題がなく、高い衝撃吸収機能が得られる。
【0023】
また、請求項6の発明は、前記支柱の一側の傾動位置を位置決めする一側位置決め手段を備えるものである。
【0024】
この請求項6の構成によれば、支柱の一側位置決め手段を備えるから、控えロープと合わせて、傾動可能な支柱を安定的に立設することができ、風などにより支柱を一側に倒そうとする力が加わっても支柱が揺動することがない。
【0025】
【発明の実施形態】
以下、本発明の防護体の第1実施形態について図1〜図19を参照して説明する。同図に示すように、防護柵1は、両側に配置した端末支柱2L,2Rの間に、複数の中間支柱3,3を並設し、これら支柱2L,3,3,2R間に網11を設ける。尚、防護柵1の一側は一例として山側Yである。
【0026】
まず、図6〜図8により網11の構成について説明すると、前記網11は合成樹脂からなる貫通型無結筋網であり、例えば合成樹脂製の繊維糸12,12Aを複数撚り合わせて線材13,13Aを形成し、これら線材13,13Aは交差方向をなし、交差部14により無結筋により相互に固定されている。尚、無結節網にはラッセル式もあるが、好ましくは貫通型を用いる。図6は構造を説明する説明図であり、同図に示すように、線材13,13Aの交差部14において、一方の線材13の繊維糸12,12の間に隙間により形成する輪部15に、他方の線材13Aの繊維糸12A,12Aを前後逆方向から挿通し、さらに、交差部14においても繊維糸12,12Aを撚って輪部15,15Aを閉めることにより、両線材13,13Aを交差部14で固定する。尚、15Aは交差部14で前記繊維糸12A,12Aの間に隙間により形成する輪部である。そして、図6は説明のために輪部15,15Aを開いて図示したが、実際の網11では、前記輪部15,15Aは閉じられた構造となる。
【0027】
また、網11は略長方形状をなし、網11の縁にはロープ材16が設けられ、このロープ材16の四方には金属製の環体17を設けている。また、図7及び図8に示すように、前記ロープ材16において線材13,13Aの端部側を折り返し、線材13,13Aの重複部分18で線材13,13A相互を固定し、表裏の線材13,13Aの間にロープ材16を配置する。
【0028】
また、網11に用いる合成樹脂としては、高密度のポリエチレンなどが好適であり、その高密度のポリエチレンを用いた場合、網11の比重は0.94〜0.96である。また、必要に応じて、網11にカーボンブラックや紫外線吸収剤を使用して耐候性を向上することができる。
【0029】
次に、前記支柱2L,2R,3とその取付構造の詳細について説明する。図9及び図10などに示すように、支柱2L,2R,3とは、H形鋼からなる本体21はフランジ部21F,21Fを前後に有し、その本体21の前下部に傾動連結部22を一体に突出し、その本体21の後の上下にそれぞれ網係止部23,23を設ける。そして、これら網係止部23,23に前記ロープ材16などを係止する。また、両側の支柱2L,2Rは、その支柱3側の上下に横ロープ連結部24を設け、中間の支柱3は左右両側にそれぞれ横ロープ材連結部24を設ける。
【0030】
さらに、支柱2L,2R,3の前上部に、一側控えロープ用の一側連結部25を設け、また、左側の支柱2Lはその防護柵外側(右側)に外側控えロープ用の外側連結部26を設け、右側の支柱2Rはその防護柵外側(左側)に外側控えロープ用の外側連結部26を設けている。尚、それら係止部23及び連結部24,25,26は板材に孔を有するものである。
【0031】
また、前記本体21には、フランジ部21F,21Fの端部同士を連結する補強連結板27が上下に間隔をおいて複数設けられている。
【0032】
斜面101などの設置場所に、支柱の取付部材31を設ける。図11〜図14に示すように、前記取付部材31は金属などからなり、ベース部32と、支柱2L,2R,3を回動可能に連結する連結受部33とを一体に有する。この連結受部33は、間隔を置いて一対の腕部34,34を前記ベース部32に立設し、それら腕部34,34の下部間に、支柱2L,2R,3の前記傾動連結部22を挿入すると共に、この傾動連結部22の孔22Aと両腕部34,34の孔34A,34Aとに、枢軸たるボルト36を挿通し、これにより取付金具31に前記傾動連結部22を回動可能に連結する。尚、図中37は、前記腕部34と前記傾動連結部22との間に配置された調整用リングであり、合成樹脂などで摩擦係数の小さい部材より構成され、前記ボルト36が挿通されている。前記ベース部32は複数のアンカーたるロックボルト38により斜面101などの設置面に固定される。また、設置面とベース部38と間には緩衝パッド39を設ける。
【0033】
また、連結受部33の上部には、前記支柱2L,2R,3の一側傾動位置を位置決めする一側位置決め手段41が設けられている。この一側位置決め手段41は、前記腕部34,34の前側に略コ時形の受部42を形成し、この受部42に着脱可能に設ける調整用プレート43を備え、この調整用プレート43は前記受部42に着脱可能な上下高さを有し、その下縁に腕部34,34の上部外面に外嵌する嵌合溝44を有し、この嵌合溝44が両側腕部34,34に外嵌することにより調整用プレート43が左右に位置決めされる。その調整用プレート43に調整用ボルト45を挿通し、挿通した前後で調整用ボルト45にナット46,46を螺合すると共に、これらナット46,46により調整用プレート43を挟着する。尚、それらナット46,46は前記腕部34,34間に挿入可能な大きさを有する。そして、ナット46,46の螺合位置を調整することにより、調整用ボルト45の頭部45Aの前後位置を調節することができ、頭部45Aに前記フランジ部21Fが当たることにより支柱2L,3,2Rの一側回動範囲が規制される。
【0034】
また、前記連結受部33には前記ボルト36位置と離れた位置に、前記支柱2L,3,2Rの回転を防止する仮止め手段47を設けている。この仮止め手段47は、前記腕部34,34に穿設した孔34B,34Bと、前記傾動連結部22に穿設した孔22Bと、これら孔34B,34B,22Bに着脱可能に挿入する仮止めピン48とからなる。そして、この例では、仮止め手段47により支柱2L,2R,3をベース部32に対して所定角度位置に位置決めできるようになっている。
【0035】
また、前記支柱の他側の傾動範囲を規制して位置決めする他側位置決め手段が設けられ、この他側位置決め手段49は、前記支柱2L,3,2Rの当接部たる下端50と、前記取付部材31とにより構成され、前記下端49を斜めに形成し、ベース部32に対して垂直位置から支柱2L,3,2Kが所定角度であるθ=25度他側に回動すると、前記下端下端49が前記ベース部32に当接することにより他側への傾動位置を位置決めしている。
【0036】
隣合う支柱2L,3,3,2Rの間の上,下段には横ロープ材51,51が張設され、これら横ロープ材51,51に図示しない結束具により網11が取り付けられている。前記横ロープ材51は一方と他方のロープ材51A,51Bよりなり、一方のロープ材51Aを調整張り具たるターンバックル52により一方の支柱2L,3,3の前記連結部24に連結し、他方のロープ材51Bを隣合う他方の支柱3,3,2Rの前記連結部24に連結し、支柱2L,3,3,2R間で両ロープ材51A,51Bの端部を重ね合わせて重複部53を形成し、この重複部53において、両ロープ材51A,51Bを締め具たるワイヤクリップ54により所定の摩擦力で締め付けている。尚、下段の横ロープ材51では、ロープ材51Bにターンバックル52が用いられている。また、両ロープ材51A,51Bの重複部53側の端部は、太さの等しい切断端となっている。
【0037】
したがって、横ロープ材51に所定以上の引張力が加わると、ワイヤクリップ54の締付力に抗してロープ材51A,51Bが離れる方向に摩擦摺動する。また、両ロープ材51A,51Bの重複部53側の端部は、太さの等しい切断端となっているから、端部がワイヤークリップ54に係止することなく抜け出し、この後の横ロープ材51から拘束されることなく網11が変形可能となり、合成樹脂製の網11の特性を生かすことができる。
【0038】
前記支柱2L,3,3,2Rの前上部の一側連結部25と、防護柵の一側である前側の地山との間には、控えロープ装置61を設ける。この控えロープ装置61は、ロープ材62とこのロープ材62の余長部62Aを摺動可能に把持する緩衝具63とを備える。
【0039】
この緩衝具63は、その緩衝具63は、図15〜図19に示すように、前記ロープ材62を所定の摩擦力で把持する一対の把持体64,64を備え、これら把持体64,64の合せ面に、ロープ材62に嵌合する嵌合溝65を形成し、両把持体64,64をボルトナットなどの締付手段66により締め付け固定する。相互に固定された把持体64,64の側面には、Uボルト67が係合する係合溝68,68が形成され、この係合溝68,68にUボルト67の両端部67T,67Tが係合する。また、Uボルト67の両端部67T,67Tを挿通するプレート69を備え、このプレート69にはロープ材62の余長部62A側を遊挿する溝部70が形成されている。そして、Uボルト67の途中を前記一側連結部25に挿通連結し、その両端部67T,67T間に、ロープ材62を締め付けた把持体64,64を嵌め入れ、さらに、端部67T,67Tを押さえ板69に挿通し、端部67T,67Tにナット71を螺合する。そして、前記一対の把持体64,64により、ロープ材62を所定の摩擦力で把持する把持具72を構成し、また、図1及び図19に示すように、控えロープ装置61の緩衝具63は、前記2つの把持具72を並べて設けている。このようにUボルト67に複数の把持具72を並べて設けることができ、また、さらに、Uボルト67を長くすれば3個以上の把持具72を並べて設けることもできる。
【0040】
また、前記ロープ材62の反余長部側はアンカーたるロックボルト73により地山に固定される。
【0041】
端部支柱2L,2Rの外側連結部26には、控えロープ装置61A,61Bが設けられ、これら控えロープ装置61A,61Bは把持具72を用いている点と、張設方向が異なる以外は、前記控えロープ装置61と同一構成であり、前記控えロープ装置61Aは、防護柵の左右方向に対して平面約30度の角度をなし、すなわちその反余長部が一側に位置し、前記控えロープ装置61Bは、防護柵の左右方向に対して平面略5度の角度をなし、すなわちその反余長部が他側に位置し、これらにより支柱2L,2Rを防護柵内側に倒す方向の力に対向している。
【0042】
そして、防護柵1の施工においては、斜面101にロックボルト38により取付部材31を固定し、支柱2L,3,2Rを仮止め手段47により仮固定した状態で、控えロープ装置61を固定する。調整用ボルト45は施工前に支柱2L,3,2Rの角度に合わせて予め調整しておき、また、必要に応じて現場で調整し、支柱2L,3,2Rが調整用ボルト45に当接することで支柱2L,3,2Rの向きを設定できる。尚、仮止め手段47は、その仮止めが不要になった後に仮止めピン48を抜いて仮固定を解除する。
【0043】
このように本実施形態では、請求項1に対応して、支柱2L,3,3,2R間に合成樹脂からなる網11を張設した防護柵1であって、支柱2L,3,3,2Rを傾動可能に立設し、支柱2L,3,3,2Rの上部と該支柱2L,3,3,2R一側の地山である斜面101との間に控えロープ装置61を設け、この控えロープ装置61のロープ材62に余長部62Aを設けると共に、この余長部62Aを摺動可能に把持する緩衝具63を設けたから、合成樹脂からなる網11は鋼製などの網に比べ、切断までの伸び率が大きいから、落石を受けると、網11が他側に伸びて衝撃を吸収し、落石を受けた網11から支柱2L,3,3,2Rに所定以上の力が加わると、緩衝具63に対して余長部62Aが摺動して支柱2L,3,3,2Rが他側に傾動する。このように落石を受けると、網11が他側に変形すると共に伸び、さらに、支柱2L,3,3,2Rが他側に傾動することにより、落石を受けてから網11が変形移動する量及び時間が大となり、衝撃吸収能力が効果的に向上する。
【0044】
また、支柱2L,3,3,2Rが他側に傾動する際、緩衝具63に対して控えロープ62の余長部62Aが摺動することにより、落石エネルギーの一部を吸収できる。
【0045】
そして、網11を合成樹脂とすることにより軽量となり、施工運搬において、クレーンなどの大型重機が不要となり、地形的に施工に制約を受ける場所にも防護柵1を設置することができる。また、合成樹脂製の網11は柔軟性を有するから、搬入時にも巻く等することにより、コンパクトにでき、同時に現場での作業性も良好となる。
【0046】
また、このように本実施形態では、請求項2に対応して、支柱2L,3,3,2R他側の傾動位置を位置決め決めする他側位置決め手段49を備えるから、落石を受けると、網11が他側に伸びて衝撃を吸収し、落石を受けた網11から支柱2L,3,3,2Rに所定以上の力が加わると、緩衝具63に対して余長部62Aが摺動して支柱2L,3,3,2Rが他側に傾動し、この他側の傾動は他側位置決め手段49により位置決めされる位置まで行われた後、支柱が止まり、この後、静止した支柱2L,3,3,2Rの強度及び網11が更に他側に伸び変形することより落石のエネルギーを効果的に吸収することができる。したがって従来のように単に支柱が倒れるだけでなく、所定角度倒れた後、支柱が剛的に落石のエネルギーを受けるから、高い衝撃吸収効果が得られる。
【0047】
また、このように本実施形態では、請求項3に対応して、他側位置決め手段49は、地山に固定した支柱用取付部材31と、支柱2L,3,3,2Rに設けられ取付部材31に当接する当接部たる下端50とを備えるから、取付部材に支柱を取り付け、支柱が他側に所定量だけ傾動すると、下端50が取付部材31に当接し、支柱2L,3,3,2Rの傾動を規制することができる。
【0048】
また、このように本実施形態では、請求項4に対応して、緩衝具63には、ロープ材62を所定の摩擦力で把持する把持具72を複数設けたから、ロープ材62の摩擦摺動による衝撃吸収効果を高めることができる。特に、共通の把持具72を用意し、その数を調整することにより、所望の衝撃吸収効果が得られるから、把持具72及び緩衝具63を汎用品として使用することができる。
【0049】
また、このように本実施形態では、請求項5に対応して、網11が無結節網であるから、網11を構成する線材13,13Aは、交差部14において結ばれずに真っ直ぐに形成されているため、網11に落石等の力が加わると、その力が網11全体に分散するため、高い衝撃吸収機能が得られる。また、結節がないから、その分軽量で厚さも薄くなり、重ねたり、折ったり、巻いたりした際、コンパクトになる。
【0050】
また、このように本実施形態では、請求項6に対応して、支柱2L,3,3,2Rの一側の傾動位置を位置決めする一側位置決め手段41を備えるから、控えロープ装置61と合わせて、傾動可能な支柱2L,3,3,2Rを安定的に立設することができ、風などにより支柱2L,3,3,2Rを一側に倒そうとする力が加わっても支柱が揺動することがない。
【0051】
また、実施形態上の効果として、取付部材31に対して支柱2L,3,2Rの角度を仮固定する仮止め手段47を設けたから、控えロープ装置61などの据付作業を容易に行うことができる。また、横ロープ材51において、両ロープ材51A,51Bの重複部53側の端部がワイヤークリップ54に係止することなく抜け出し可能に構成したから、抜け出し後は、横ロープ材51から拘束されることなく網11が変形可能となり、合成樹脂製の網11の特性を十分に生かすことができる。また、一側位置決め手段41を備えるから、控えロープ装置61のロープ材62をテンションをかけた状態で設置することができる。
【0052】
図20は本発明の第2実施形態を示し、上記第1実施形態と同一部分に同一符号を付し、その詳細な説明を省略して詳述すると、この例では横ロープ材51は1本のロープ材からなり、その横ロープ材51の余長部51Yを前記緩衝具63により把持して前記横ロープ材連結部24に連結している。また、余長部51Yの端部は、太さの等しい切断端となっており、前記端部が緩衝具63に係止することなく抜け出し可能しており、この例においても、横ロープ材51に所定以上の引張力が加わると、把持具72の締付力に抗して該把持具72に対して余長部51Yが摩擦摺動し、さらに、余長部51Yの端部が把持具72などに係止することなく抜け出し、この後の横ロープ材51から拘束されることなく網11が変形可能となり、合成樹脂製の網11の特性を生かすことができる。
【0053】
尚、本発明は、前記実施形態に限定されるものではなく、本発明の要旨の範囲内で種々の変形実施が可能である。例えば、重複部53及び締め具は本発明の余長部及び緩衝具の他の例であり、例えばロープ材をループ状にして余長部を構成してもよい。また、実施例では地山にコンクリート基礎やコンクリートブロックなどを設けてロックアンカーを固定するようにしてもよい。
【0054】
【発明の効果】
請求項1の発明は、支柱間に合成樹脂からなる網を張設した防護柵であって、前記支柱を傾動可能に立設し、前記支柱の上部と該支柱一側の地山との間に控えロープ装置を設け、この控えロープ装置のロープ材に余長部を設けると共に、この余長部を摺動可能に把持する緩衝具を設けたものであり、工法簡易にして低価格での施工を可能とし、落石等のエネルギー吸収効果に優れた防護柵を提供することができる。
【0055】
また、請求項2の発明は、前記支柱の他側の傾動位置を位置決め決めする他側位置決め手段を備えるものであり、工法簡易にして低価格での施工を可能とし、落石等のエネルギー吸収効果に優れた防護柵を提供することができる。
【0056】
また、請求項3の発明は、前記他側位置決め手段は、前記地山に固定した支柱用取付部材と、前記支柱に設けられ前記取付部材に当接する当接部とを備えるものであり、工法簡易にして低価格での施工を可能とし、落石等のエネルギー吸収効果に優れた防護柵を提供することができる。
【0057】
また、請求項4の発明は、前記緩衝具には、ロープ材を所定の摩擦力で把持する把持具を複数設けたものであり、工法簡易にして低価格での施工を可能とし、落石等のエネルギー吸収効果に優れた防護柵を提供することができる。
【0058】
また、請求項5の発明は、前記網が無結節網でああり、工法簡易にして低価格での施工を可能とし、落石等のエネルギー吸収効果に優れた防護柵を提供することができる。
【0059】
また、請求項6の発明は、前記支柱の一側の傾動位置を位置決めする一側位置決め手段を備えるものであり、工法簡易にして低価格での施工を可能とし、落石等のエネルギー吸収効果に優れた防護柵を提供することができる。
【図面の簡単な説明】
【図1】本発明の第1実施形態を示す防護体の側面図である。
【図2】同上、一部正面図である。
【図3】同上、一部平面図である。
【図4】同上、全体正面図である。
【図5】同上、全体平面図である。
【図6】同上、網の構造を説明する正面説明図である。
【図7】同上、網の端部の平面展開図であり、網とロープ材とを示す。
【図8】同上、一部を断面にした網の側面図であり、図8(A)は網の端部側にロープ材を重ねて配置した状態、図8(B)は網の端部を折り返して重複部分を形成した状態を示す。
【図9】同上、端末支柱を示し、図9(A)は正面図、図9(B)は側面図である。
【図10】同上、中間支柱を示し、図10(A)は正面図、図10(B)は側面図である。
【図11】同上、支柱下部の側面図である。
【図12】同上、支柱下部の背面図である。
【図13】同上、支柱の平面図である。
【図14】同上、取付部材の正面図であり、調整用プレートを取り外した状態である。
【図15】同上、緩衝具の正面図である。
【図16】同上、緩衝具の把持具の平面図である。
【図17】同上、緩衝具の把持具の側面図である。
【図18】同上、緩衝具の側面図である。
【図19】同上、2つの把持具を有する緩衝具の側面図である。
【図20】本発明の第2実施形態を示す支柱の平面図である。
【符号の説明】
1 防護柵
2 端末支柱
3 中間支柱
11 網
31 取付部材
41 一側位置決め手段
47 仮止め手段
49 他側位置決め手段
50 下端(当接部)
61 控えロープ装置
62 ロープ材
62A 余長部
63 緩衝具
101  斜面(設置場所)
Y 山側
[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a protective fence constructed on an inclined surface of a mountainside to prevent falling or flowing into a road or the like by receiving snow or falling rocks.
[0002]
[Prior art]
2. Description of the Related Art A protective fence constructed on a slope of a hillside or the like to receive falling rocks or snowfall and to prevent falling and inflow to a road or the like has been known. For example, Japanese Patent Application Laid-Open No. 7-197423 discloses a protective fence. Vertical holes are drilled at intervals on the slope, pipe posts built in the vertical holes are arranged side by side, and a protective fence such as a falling rock with a wire mesh stretched along with multiple stages of cables on each of these pipe posts is proposed. The protective surface is made of wire mesh.
[0003]
In addition, regarding a net used for a protective surface, JP-A-2000-273827 discloses that a protective net is made of steel or a rigid wire such as a wire attached in parallel, a rigid wire knitted on a net with a rigid wire, And other known nets such as a combination of a horizontal rope material and a wire net (Japanese Patent Publication No. 0011).
[0004]
As in the above-described prior art, in a protective body using this type of net, a road or the like is protected from falling rocks or the like by combining a wire rope or a steel net.
[0005]
However, in the case of using a steel wire rope or net, since the member itself is heavy, a heavy machine for installation is required, and there is a problem that the construction range is restricted, the construction period is lengthened, and the construction cost is increased. And since the protection body provided for rock fall protection is often provided on a mountain slope which is unsuitable for use of heavy equipment, in the construction in which the protection body is provided on such a mountain slope, the members are heavy. Then, the carrying-in work becomes complicated and there is a problem that the workability is inferior.
[0006]
Also, in the conventional protective fence, when rocks are received by the net, the nets deform and absorb the energy of the rocks.At the same time, the energy of the rocks is added to the struts from the net, and the struts that finally receive the bending moment deform. To absorb energy. In a conventional protective fence using a steel net, the wire constituting the net is excellent in tensile strength, and is effective in the case of large rock fall energy. However, a protective fence receiving such a large amount of rockfall energy requires large-sized pillars and foundations on which the pillars are erected.
[0007]
If the impact absorption time from when the protective fence receives the falling rock to when the falling rock stops can be extended, the effect of absorbing the falling rock energy can be enhanced. Therefore, although it is different from the field of protective fences, the bending pole such as a spring material is provided at the lower part of the pole in the folding pole of Japanese Utility Model Laid-Open Publication No. 2-37920 so that the pole can be bent. In addition, if the pillar of the protective fence can be bent over like the pole, the shock absorbing time can be lengthened by the time the pillar falls after receiving the falling rock, and the falling rock energy absorbing effect is improved.
[0008]
However, with conventional protective fences, if the support can be turned over, if the support is installed diagonally on a slope etc., the support will tilt to the valley side due to its own weight, or will swing to the mountain side when receiving wind from the valley. However, a sufficient absorption effect cannot be obtained even if the support column can be simply tilted.
[0009]
An object of the present invention is to provide a protective fence which is excellent in workability, enables construction at a low cost by simplifying a construction method, and has an excellent effect of absorbing energy such as falling rocks.
[0010]
[Means for Solving the Problems]
The invention according to claim 1 is a protective fence in which a net made of synthetic resin is stretched between pillars, and the pillar is tiltably erected, and is provided between the upper part of the pillar and the ground on one side of the pillar. Is provided with a stay rope device, an extra length portion is provided on the rope material of the stay rope device, and a shock absorber for slidably gripping the extra length portion is provided.
[0011]
According to the structure of the first aspect, the net made of synthetic resin is more easily deformed than the net made of steel or the like, and the elongation until cutting is large. When a force greater than a predetermined value is applied to the support from the net that has received the falling rock, the extra length slides against the shock absorber, and the support tilts to the other side. When the rock is received in this way, the net is deformed and stretched to the other side, and furthermore, the support is tilted to the other side, so that the amount and time for the net to deform and move after receiving the rock is increased, and the shock absorbing capacity is increased. Is effectively improved.
[0012]
Further, when the support column tilts to the other side, a part of the falling rock energy can be absorbed by the extra length of the stay rope sliding with respect to the shock absorber.
[0013]
In addition, since the net is made of a synthetic resin, the weight is reduced, large-sized heavy equipment such as a crane is not required in the construction and transportation, and a protective fence can be installed in a place where the construction is restricted geographically. In addition, since the synthetic resin net has flexibility, it can be compacted by being wound at the time of carrying in, and at the same time, the workability at the site is improved.
[0014]
Further, the invention of claim 2 is provided with another side positioning means for positioning and determining the tilt position of the other side of the column.
[0015]
According to the configuration of claim 2, when falling rocks are received, the net extends to the other side and absorbs impact. The part slides and the column tilts to the other side, and this other-side tilting is performed to the position determined by the other-side positioning means, then the column stops, and then the strength and net of the stationary column are reduced. Further, the energy of the falling rock can be effectively absorbed by extending and deforming to the other side.
[0016]
Also, in the invention according to claim 3, the other-side positioning means includes a pole mounting member fixed to the ground, and a contact portion provided on the column and abutting on the mounting member.
[0017]
According to this configuration, when the support is attached to the mounting member and the support tilts by a predetermined amount toward the other side, the contact portion contacts the mounting member, and the tilt of the support is regulated.
[0018]
According to a fourth aspect of the present invention, the shock absorber is provided with a plurality of grippers for gripping the rope material with a predetermined frictional force.
[0019]
According to the configuration of the fourth aspect, by providing a plurality of gripping tools, it is possible to enhance the shock absorbing effect by frictional sliding of the rope material. In particular, by preparing a common gripping tool and adjusting the number thereof, a desired impact absorbing effect can be obtained, so that the gripping tool can be used as a general-purpose product.
[0020]
In the invention according to claim 5, the network is a knotless network.
[0021]
According to the fifth aspect of the present invention, since the wire constituting the net is formed straight without being tied at the intersection, when a force is applied to the net, the force is dispersed throughout the net, so that a high impact is obtained. An absorption function is obtained. Also, since there are no knots, the weight is reduced by that much, and it becomes compact when layered, folded or rolled.
[0022]
In the knotted net, when the wires are joined at the intersection, the tensile force concentrates on the wire at the intersection, which tends to be weak.However, the knotless net does not have such a problem and has a high shock absorbing function. Can be
[0023]
The invention according to claim 6 is provided with one-side positioning means for positioning a tilt position of one side of the column.
[0024]
According to the configuration of claim 6, since the positioning means is provided on one side of the support, the tiltable support can be stably erected together with the staying rope, and the support is tilted to one side by wind or the like. The strut does not swing even if the force is applied.
[0025]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, a first embodiment of a protection body of the present invention will be described with reference to FIGS. As shown in the figure, the protective fence 1 has a plurality of intermediate supports 3, 3 arranged in parallel between terminal supports 2L, 2R arranged on both sides, and a net 11 between these supports 2L, 3, 3, 2R. Is provided. One side of the protective fence 1 is the mountain side Y as an example.
[0026]
First, the structure of the mesh 11 will be described with reference to FIGS. 6 to 8. The mesh 11 is a penetrating non-knotted mesh made of synthetic resin, for example, by twisting a plurality of fiber yarns 12 and 12A made of synthetic resin into a wire 13. , 13A, and these wires 13, 13A form a crossing direction, and are fixed to each other by crossing portions 14 by means of non-connecting muscles. In addition, although there is also a Russell type as a knotless net, a penetrating type is preferably used. FIG. 6 is an explanatory view for explaining the structure. As shown in FIG. 6, at an intersection 14 of the wires 13, 13 </ b> A, a loop portion 15 formed by a gap between the fiber yarns 12 of one of the wires 13. By inserting the fiber yarns 12A, 12A of the other wire rod 13A from the front and rear opposite directions, and twisting the fiber yarns 12, 12A also at the intersection 14 to close the loop parts 15, 15A, the two wire rods 13, 13A are closed. At the intersection 14. Reference numeral 15A denotes an annular portion formed by a gap between the fiber yarns 12A at the intersection portion 14. Although FIG. 6 shows the loop portions 15 and 15A opened for the sake of explanation, the actual net 11 has a structure in which the loop portions 15 and 15A are closed.
[0027]
Further, the net 11 has a substantially rectangular shape, and a rope member 16 is provided at an edge of the net 11, and a metal ring 17 is provided on four sides of the rope member 16. As shown in FIGS. 7 and 8, the ends of the wires 13, 13 A in the rope 16 are folded back, and the wires 13, 13 A are fixed to each other at an overlapping portion 18 of the wires 13, 13 A. , 13A are arranged with a rope material 16.
[0028]
As the synthetic resin used for the net 11, high-density polyethylene or the like is suitable. When the high-density polyethylene is used, the specific gravity of the net 11 is 0.94 to 0.96. Further, if necessary, the net 11 can be improved in weather resistance by using carbon black or an ultraviolet absorber.
[0029]
Next, details of the columns 2L, 2R, 3 and the mounting structure thereof will be described. As shown in FIGS. 9 and 10 and the like, the pillars 2L, 2R, and 3 mean that a main body 21 made of H-shaped steel has front and rear flange portions 21F and 21F, and a tilting connecting portion 22 Are integrally formed, and mesh retaining portions 23, 23 are provided on the upper and lower sides after the main body 21, respectively. Then, the rope material 16 and the like are locked to these net locking portions 23 and 23. Further, the columns 2L and 2R on both sides are provided with horizontal rope connecting portions 24 on the upper and lower sides of the column 3 side, and the intermediate column 3 is provided with horizontal rope material connecting portions 24 on both the left and right sides.
[0030]
Further, a one-side connecting portion 25 for a one-side stay rope is provided on the front upper part of the columns 2L, 2R, 3 and the left-side column 2L is provided on the outside (right side) of the protective fence for an outside stay rope. The right support 2R is provided with an outer connecting portion 26 for an outer stay rope on the outside (left side) of the protective fence. The locking portion 23 and the connecting portions 24, 25, 26 have holes in the plate material.
[0031]
Further, the main body 21 is provided with a plurality of reinforcing connecting plates 27 for connecting the ends of the flange portions 21F, 21F to each other with a vertical interval.
[0032]
A mounting member 31 for a pillar is provided at an installation location such as the slope 101. As shown in FIGS. 11 to 14, the mounting member 31 is made of metal or the like, and integrally has a base portion 32 and a connection receiving portion 33 that rotatably connects the columns 2L, 2R, and 3 to each other. The connection receiving portion 33 has a pair of arms 34, 34 erected on the base portion 32 at intervals, and between the lower portions of the arms 34, 34, the tilt connection portions of the columns 2 L, 2 R, 3. At the same time, the bolt 36 serving as a pivot is inserted into the hole 22A of the tilt connecting portion 22 and the holes 34A, 34A of the arms 34, 34, thereby turning the tilt connecting portion 22 to the mounting bracket 31. Connect movably. In the drawing, reference numeral 37 denotes an adjusting ring disposed between the arm portion 34 and the tilt connection portion 22. The adjusting ring 37 is made of a member having a small friction coefficient such as synthetic resin, and the bolt 36 is inserted therethrough. I have. The base 32 is fixed to an installation surface such as a slope 101 by a plurality of lock bolts 38 serving as anchors. Further, a buffer pad 39 is provided between the installation surface and the base portion 38.
[0033]
In addition, a one-side positioning means 41 for positioning the one-side tilt position of the columns 2L, 2R, 3 is provided above the connection receiving portion 33. The one-side positioning means 41 is provided with a substantially U-shaped receiving portion 42 on the front side of the arms 34, 34, and is provided with an adjusting plate 43 detachably provided on the receiving portion 42. Has an upper and lower height that can be attached to and detached from the receiving portion 42, and has a fitting groove 44 on the lower edge thereof which is fitted to the upper outer surface of the arms 34, 34. , 34, the adjustment plate 43 is positioned right and left. An adjusting bolt 45 is inserted through the adjusting plate 43, and nuts 46, 46 are screwed to the adjusting bolt 45 before and after the adjusting bolt 43 is inserted, and the adjusting plate 43 is clamped by the nuts 46, 46. The nuts 46 have a size that can be inserted between the arms 34. The front and rear positions of the head 45A of the adjusting bolt 45 can be adjusted by adjusting the screwing positions of the nuts 46, 46. The struts 2L, 3 can be adjusted by the flange 21F hitting the head 45A. , 2R is restricted.
[0034]
Further, a temporary fixing means 47 for preventing rotation of the columns 2L, 3 and 2R is provided at a position apart from the bolt 36 in the connection receiving portion 33. The temporary fixing means 47 is provided with holes 34B, 34B formed in the arms 34, 34, a hole 22B formed in the tilt connecting portion 22, and a temporary insertable and removable insertion in these holes 34B, 34B, 22B. And a locking pin 48. In this example, the columns 2L, 2R, and 3 can be positioned at predetermined angular positions with respect to the base 32 by the temporary fixing means 47.
[0035]
Further, other-side positioning means for regulating and positioning the other-side tilting range of the column is provided, and the other-side positioning means 49 includes a lower end 50 which is a contact portion of the columns 2L, 3, 2R, and the mounting member. The lower end 49 is formed obliquely, and when the support columns 2L, 3, 2K are rotated from the vertical position to the base 32 by a predetermined angle θ = 25 degrees to the other side, the lower end lower end is formed. 49 abuts on the base portion 32 to determine the tilt position to the other side.
[0036]
Horizontal rope members 51, 51 are stretched over and below the adjacent columns 2L, 3, 3, 2R, and the net 11 is attached to the horizontal rope members 51, 51 with a tying tool (not shown). The horizontal rope member 51 is composed of one and the other rope members 51A, 51B. The one rope member 51A is connected to the connecting portion 24 of one of the columns 2L, 3, 3 by a turnbuckle 52 which is an adjusting member. Of the rope material 51B is connected to the connecting portion 24 of the other adjacent column 3, 3, 2R, and the ends of both the rope materials 51A, 51B are overlapped between the columns 2L, 3, 3, 2R to form an overlapping portion 53. In the overlapping portion 53, the rope members 51A and 51B are fastened with a predetermined frictional force by a wire clip 54 serving as a fastener. In the lower horizontal rope member 51, a turnbuckle 52 is used for the rope member 51B. The ends of the rope members 51A and 51B on the overlapping portion 53 side are cut ends having the same thickness.
[0037]
Therefore, when a predetermined or more tensile force is applied to the horizontal rope member 51, the rope members 51A and 51B frictionally slide in a direction in which the rope members 51A and 51B are separated against the tightening force of the wire clip 54. Further, since the ends of the two rope members 51A and 51B on the overlapping portion 53 side are cut ends having the same thickness, the ends come out without being locked to the wire clip 54, and the horizontal rope members thereafter. The net 11 can be deformed without being restrained by 51, and the characteristics of the net 11 made of synthetic resin can be utilized.
[0038]
A stay rope device 61 is provided between the one-side connecting portion 25 of the front upper portion of the columns 2L, 3, 3, and 2R and the ground on the front side, which is one side of the protective fence. The stay rope device 61 includes a rope member 62 and a shock absorber 63 for slidably holding the extra length 62A of the rope member 62.
[0039]
As shown in FIGS. 15 to 19, the shock absorber 63 includes a pair of grippers 64, 64 for gripping the rope member 62 with a predetermined frictional force. A fitting groove 65 to be fitted to the rope material 62 is formed in the mating surface of the two members, and the both gripping bodies 64, 64 are tightened and fixed by tightening means 66 such as a bolt and nut. Engagement grooves 68, 68 with which the U bolt 67 is engaged are formed on the side surfaces of the gripping bodies 64, 64 fixed to each other, and both ends 67T, 67T of the U bolt 67 are formed in the engagement grooves 68, 68. Engage. Further, a plate 69 is provided through which both ends 67T, 67T of the U-bolt 67 are inserted, and a groove 70 for loosely inserting the extra length portion 62A of the rope material 62 is formed in the plate 69. Then, the U-bolt 67 is inserted through the middle of the U-side connecting portion 25 and connected to the one-side connecting portion 25, and the holding members 64, 64 on which the rope member 62 is tightened are fitted between both ends 67T, 67T. Is inserted into the holding plate 69, and the nuts 71 are screwed into the ends 67T, 67T. The pair of gripping bodies 64, 64 constitute a gripping tool 72 for gripping the rope member 62 with a predetermined frictional force. As shown in FIGS. Is provided with the two gripping tools 72 side by side. As described above, the plurality of gripping tools 72 can be provided side by side on the U bolt 67. Further, if the U bolt 67 is made longer, three or more gripping tools 72 can be provided side by side.
[0040]
Further, the extra length side of the rope member 62 is fixed to the ground by a lock bolt 73 serving as an anchor.
[0041]
The staying rope devices 61A and 61B are provided on the outer connecting portions 26 of the end supports 2L and 2R, and the staying rope devices 61A and 61B are different from the point that the holding devices 72 are used and the stretching direction is different. The stay rope device 61A has the same structure as that of the stay rope device 61, and the stay rope device 61A has an angle of about 30 degrees in a plane with respect to the left-right direction of the protective fence. The rope device 61B makes an angle of approximately 5 degrees in a plane with respect to the left-right direction of the protective fence, that is, the extra length is located on the other side, and thereby the force in the direction of tilting the columns 2L and 2R inside the protective fence. Facing.
[0042]
When the protective fence 1 is constructed, the attachment member 31 is fixed to the slope 101 by the lock bolt 38, and the stay rope device 61 is fixed in a state where the columns 2L, 3 and 2R are temporarily fixed by the temporary fixing means 47. The adjustment bolts 45 are adjusted beforehand in accordance with the angles of the columns 2L, 3, 2R before construction, and are adjusted on site if necessary, so that the columns 2L, 3, 2R come into contact with the adjustment bolts 45. Thus, the directions of the columns 2L, 3, 2R can be set. The temporary fixing means 47 releases the temporary fixing pin 48 after the temporary fixing becomes unnecessary, and releases the temporary fixing.
[0043]
As described above, in the present embodiment, the protective fence 1 in which the net 11 made of a synthetic resin is stretched between the columns 2L, 3, 3, and 2R corresponds to claim 1, and the columns 2L, 3, 3, 2R is erected in a tiltable manner, and a stay rope device 61 is provided between the upper part of the support 2L, 3, 3, 2R and the slope 101 which is the ground on one side of the support 2L, 3, 3, 2R. Since the extra length portion 62A is provided on the rope member 62 of the stay rope device 61 and the buffer 63 for slidably holding the extra length portion 62A is provided, the net 11 made of synthetic resin is smaller than a net made of steel or the like. Since the elongation rate until cutting is large, when falling rocks are received, the net 11 expands to the other side to absorb the impact, and a predetermined force or more is applied to the columns 2L, 3, 3, and 2R from the net 11 that has received the rocks. The extra length 62A slides with respect to the buffer 63 so that the columns 2L, 3, 3, and 2R are on the other side. To tilt. When the rock 11 is received in this way, the net 11 is deformed and extended to the other side, and furthermore, the columns 2L, 3, 3, and 2R are tilted to the other side, so that the net 11 deforms and moves after receiving the rock fall. And the time becomes longer, and the shock absorbing ability is effectively improved.
[0044]
Further, when the columns 2L, 3, 3, and 2R are tilted to the other side, a part of the falling rock energy can be absorbed by the extra length 62A of the retaining rope 62 sliding with respect to the shock absorber 63.
[0045]
And, since the net 11 is made of a synthetic resin, the weight is reduced, and a large heavy machine such as a crane is not required in the construction and transportation, and the protective fence 1 can be installed in a place where construction is restricted geographically. In addition, since the synthetic resin net 11 has flexibility, it can be compacted by being wound at the time of carrying in, and at the same time, the workability on site can be improved.
[0046]
Further, in this embodiment, in accordance with the present invention, since the other side positioning means 49 for determining the tilting position of the other side of the columns 2L, 3, 3, 2R is provided, when a falling rock is received, 11 extends to the other side to absorb the impact, and when a predetermined force or more is applied to the columns 2L, 3, 3, and 2R from the net 11 that has received the falling rock, the extra length portion 62A slides against the shock absorber 63. The supporting columns 2L, 3, 3, and 2R are tilted to the other side, and the tilting of the other side is performed until the position is determined by the other-side positioning means 49, and then the columns are stopped. The strength of the 3,3,2R and the further expansion and deformation of the net 11 on the other side allow the energy of rock fall to be effectively absorbed. Therefore, not only does the column simply fall as in the related art, but also after the column has fallen by a predetermined angle, the column rigidly receives the energy of falling rocks, so that a high shock absorbing effect can be obtained.
[0047]
Further, in this embodiment, in accordance with the third aspect, the other-side positioning means 49 includes the mounting member 31 for the pole fixed to the ground and the mounting members provided on the columns 2L, 3, 3, and 2R. The lower end 50 abuts on the mounting member 31 and the lower end 50 comes into contact with the mounting member 31 when the column is tilted to the other side by a predetermined amount. 2R tilt can be regulated.
[0048]
Further, in this embodiment, a plurality of gripping tools 72 for gripping the rope material 62 with a predetermined frictional force are provided in the buffering tool 63 according to the fourth aspect of the present invention. Can enhance the shock absorbing effect. In particular, by preparing a common gripping tool 72 and adjusting the number thereof, a desired impact absorbing effect can be obtained, so that the gripping tool 72 and the buffer 63 can be used as general-purpose products.
[0049]
Further, in this embodiment, according to claim 5, since the net 11 is a knotless net, the wires 13 and 13A constituting the net 11 are formed straight at the intersection 14 without being tied. Therefore, when a force such as a falling rock is applied to the net 11, the force is dispersed throughout the net 11, so that a high shock absorbing function can be obtained. In addition, since there are no knots, the weight is reduced and the thickness is reduced by that much, and it becomes compact when layered, folded or rolled.
[0050]
Further, in the present embodiment, the one-side positioning means 41 for positioning the one-side tilting position of one of the columns 2L, 3, 3, and 2R is provided according to the sixth aspect. Therefore, the tiltable columns 2L, 3, 3, 2R can be stably erected, and even if a force is applied to the columns 2L, 3, 3, 2R to one side due to wind or the like, the columns can be tilted. Does not swing.
[0051]
Further, as an effect on the embodiment, since the temporary fixing means 47 for temporarily fixing the angles of the columns 2L, 3 and 2R with respect to the mounting member 31 is provided, the installation work of the stay rope device 61 and the like can be easily performed. . In the horizontal rope material 51, the ends of the two rope materials 51A and 51B on the overlapping portion 53 side are configured to be able to escape without being locked to the wire clip 54. Thus, the net 11 can be deformed without using it, and the characteristics of the synthetic resin net 11 can be fully utilized. Further, since the one-side positioning means 41 is provided, the rope member 62 of the stay rope device 61 can be installed in a state of being tensioned.
[0052]
FIG. 20 shows a second embodiment of the present invention. The same parts as those in the first embodiment are denoted by the same reference numerals, and detailed description thereof is omitted. In this example, one horizontal rope member 51 is used. The extra length 51Y of the horizontal rope material 51 is gripped by the buffer 63 and connected to the horizontal rope material connecting portion 24. In addition, the end of the extra length portion 51Y is a cut end having the same thickness, and the end can be pulled out without being locked to the shock absorber 63. When a predetermined or more tensile force is applied to the gripping tool 72, the extra length 51Y frictionally slides against the gripping tool 72, and the end of the extra length 51Y is gripped by the gripping tool. Thus, the net 11 can be deformed without being locked by the horizontal rope member 51, and can be deformed without being restrained by the horizontal rope member 51, so that the characteristics of the net 11 made of synthetic resin can be utilized.
[0053]
Note that the present invention is not limited to the above embodiment, and various modifications can be made within the scope of the present invention. For example, the overlapping portion 53 and the fastener are other examples of the extra length portion and the shock absorbing device of the present invention. For example, the extra length portion may be formed by forming a rope material into a loop shape. In the embodiment, a concrete foundation or a concrete block may be provided on the ground to fix the lock anchor.
[0054]
【The invention's effect】
The invention according to claim 1 is a protective fence in which a net made of synthetic resin is stretched between pillars, and the pillar is tiltably erected, and is provided between the upper part of the pillar and the ground on one side of the pillar. The stay rope device is provided in the rope material of the stay rope device, and an extra length portion is provided, and a buffer is provided for slidably holding the extra length portion. It is possible to provide a protective fence which enables construction and has an excellent effect of absorbing energy such as falling rocks.
[0055]
Further, the invention of claim 2 is provided with another side positioning means for positioning and determining the tilting position of the other side of the support pillar, enabling construction at a low cost by simplifying the construction method, and effect of absorbing energy such as falling rocks. An excellent protective fence can be provided.
[0056]
According to a third aspect of the present invention, the other-side positioning means includes a column mounting member fixed to the ground, and a contact portion provided on the column and contacting the mounting member. It is possible to provide a protective fence which is simple and can be constructed at a low price and which is excellent in an effect of absorbing energy such as falling rocks.
[0057]
Further, the invention according to claim 4 is characterized in that the shock absorber is provided with a plurality of grippers for gripping the rope material with a predetermined frictional force. A protective fence excellent in the energy absorbing effect of the present invention can be provided.
[0058]
Further, the invention according to claim 5 can provide a protective fence which is a knotless net, enables construction at a low cost by simplifying a construction method, and is excellent in an effect of absorbing energy such as falling rocks.
[0059]
The invention according to claim 6 is provided with one-side positioning means for positioning the tilting position of one side of the column, and enables construction at a low cost by simplifying the construction method, and has an effect of absorbing energy such as falling rocks. An excellent protective fence can be provided.
[Brief description of the drawings]
FIG. 1 is a side view of a protective body according to a first embodiment of the present invention.
FIG. 2 is a partial front view of the same.
FIG. 3 is a partial plan view of the same.
FIG. 4 is an overall front view of the same.
FIG. 5 is an overall plan view of the same.
FIG. 6 is an explanatory front view illustrating the structure of the net;
FIG. 7 is a plan exploded view of the end of the net, showing the net and the rope material.
FIG. 8 is a side view of the net with a partial cross section, in which FIG. 8 (A) shows a state in which the rope material is arranged on the end side of the net and FIG. 8 (B) shows the end of the net. Is folded to form an overlapped portion.
9A and 9B show a terminal support, FIG. 9A is a front view, and FIG. 9B is a side view.
10 (a) and 10 (b) show an intermediate support, and FIG. 10 (A) is a front view and FIG.
FIG. 11 is a side view of the lower part of the support.
FIG. 12 is a rear view of the lower part of the support column.
FIG. 13 is a plan view of the support column.
FIG. 14 is a front view of the same mounting member, with the adjustment plate removed.
FIG. 15 is a front view of the shock absorber according to the third embodiment.
FIG. 16 is a plan view of the gripper of the shock absorbing device.
FIG. 17 is a side view of the holding tool of the shock absorbing tool.
FIG. 18 is a side view of the shock absorber.
FIG. 19 is a side view of the shock absorber having the two gripping tools.
FIG. 20 is a plan view of a column showing a second embodiment of the present invention.
[Explanation of symbols]
1 Guard fence
2 Terminal support
3 middle supports
11 net
31 Mounting member
41 One-side positioning means
47 Temporary fastening means
49 Other-side positioning means
50 Lower end (contact part)
61 Stay rope device
62 rope material
62A extra length
63 shock absorber
101 Slope (location)
Y mountain side

Claims (6)

支柱間に合成樹脂からなる網を張設した防護柵であって、前記支柱を傾動可能に立設し、前記支柱の上部と該支柱一側の地山との間に控えロープ装置を設け、この控えロープ装置のロープ材に余長部を設けると共に、この余長部を摺動可能に把持する緩衝具を設けたことを特徴とする防護柵。A protective fence in which a net made of synthetic resin is stretched between columns, and the columns are tiltably erected, and a retaining rope device is provided between the upper portion of the columns and the ground on one side of the columns, A protective fence comprising: an extra length portion provided in the rope material of the stay rope device; and a shock absorber for slidably holding the extra length portion. 前記支柱の他側の傾動位置を位置決め決めする他側位置決め手段を備えることを特徴とする請求項1記載の防護体。2. The protective body according to claim 1, further comprising another side positioning means for determining a tilt position of the other side of the column. 前記他側位置決め手段は、前記地山に固定した支柱用取付部材と、前記支柱に設けられ前記取付部材に当接する当接部とを備えることを特徴とする請求項2記載の防護柵。3. The protective fence according to claim 2, wherein the other-side positioning means includes a pole mounting member fixed to the ground, and a contact portion provided on the column and in contact with the mounting member. 4. 前記緩衝具には、ロープ材を所定の摩擦力で把持する把持具を複数設けたことを特徴とする請求項1〜3のいずれか1項に記載の防護柵。The protective fence according to any one of claims 1 to 3, wherein the shock-absorbing member is provided with a plurality of grippers for gripping the rope material with a predetermined frictional force. 前記網が無結節網であることを特徴とする請求項1〜4のいずれか1項に記載の防護柵。The protective fence according to any one of claims 1 to 4, wherein the net is a knotless net. 前記支柱の一側の傾動位置を位置決めする一側位置決め手段を備えることを特徴とする請求項1記載の防護柵。2. The protective fence according to claim 1, further comprising one-side positioning means for positioning a tilt position on one side of the support.
JP2002234098A 2002-08-09 2002-08-09 Protective fence Expired - Lifetime JP3944550B2 (en)

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Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2008144381A (en) * 2006-12-06 2008-06-26 Nihon Samicon Co Ltd Avalanche/falling stone preventive fence
JP2009161926A (en) * 2007-12-28 2009-07-23 Raiteku:Kk Storage structure and storage method for rock fall guard fence
JP2010106503A (en) * 2008-10-29 2010-05-13 Maeda Kosen Co Ltd Impact absorbing fence
KR101007626B1 (en) 2009-11-04 2011-01-12 김영수 Net for preventing approach of birds and installing method of the same using wire tension
CN102587396A (en) * 2012-04-06 2012-07-18 长沙理工大学 Side slope anti-seismic flexible passive protective net system
KR200462947Y1 (en) 2010-07-01 2012-10-10 김경임 Device for preventing approach of birds
JP2013057236A (en) * 2012-11-09 2013-03-28 Raiteku:Kk Storage structure for stone-fall guard fence and storage method
JP2014001523A (en) * 2012-06-15 2014-01-09 Raiteku:Kk Guard fence
JP7507477B2 (en) 2020-07-08 2024-06-28 筑豊金網工業株式会社 Post base, post and rockfall prevention fence

Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2008144381A (en) * 2006-12-06 2008-06-26 Nihon Samicon Co Ltd Avalanche/falling stone preventive fence
JP2009161926A (en) * 2007-12-28 2009-07-23 Raiteku:Kk Storage structure and storage method for rock fall guard fence
JP2010106503A (en) * 2008-10-29 2010-05-13 Maeda Kosen Co Ltd Impact absorbing fence
KR101007626B1 (en) 2009-11-04 2011-01-12 김영수 Net for preventing approach of birds and installing method of the same using wire tension
KR200462947Y1 (en) 2010-07-01 2012-10-10 김경임 Device for preventing approach of birds
CN102587396A (en) * 2012-04-06 2012-07-18 长沙理工大学 Side slope anti-seismic flexible passive protective net system
JP2014001523A (en) * 2012-06-15 2014-01-09 Raiteku:Kk Guard fence
JP2013057236A (en) * 2012-11-09 2013-03-28 Raiteku:Kk Storage structure for stone-fall guard fence and storage method
JP7507477B2 (en) 2020-07-08 2024-06-28 筑豊金網工業株式会社 Post base, post and rockfall prevention fence

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